Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df848a877bcaf63…

MALICIOUS

PDF

88.9 KB Created: 2021-06-27 15:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c0005bdfde27ca33ebf9a17813a6ba4 SHA-1: 264bad972b2ef7354379ca821f89d31afc81ad55 SHA-256: 4df848a877bcaf63673d2e5e1d1cac41b8554b1c5ccc5401a004732fab288b8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and link farm behavior indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac11cb269d---64068358799.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/n7uen087u9cjd5k27s317p9180/sufomus.pdf
    • http://poltinik.ru/userfiles/file/30225241581.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5380cc8a67---15563174169.pdf
    • http://meadescafe.com/userfiles/file/zapalofegukinepema.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4a781e9816960d760b73fd306a9865ba/fapoze.pdf
    • http://banhangcongnghe.com/upload/FCK/file/kotunataxawawikez.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60f11d0fe---55922074228.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/o6fltjv6nuie8b872gnl4nevm7/fedobemazava.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a69faa132---xafimadit.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210602_3310BA600EBD3DD9.pdf
    • https://alice-immo.com/userfiles/file/57433145681.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/016310f73fb59dab6d15b62a5ef6021c/66506841352.pdf
    • https://myphi.biz/nbloom/fckuploads/file/12311241439.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9m5c8mmjfbcvid6hrb2dofcn65/30997146069.pdf
    • http://datev.hu/ckfinder/userfiles/files/nokag.pdf
    • http://bajajsports.com/userfiles/file/pidaxonodopor.pdf
    • https://asiarsolutions.com/userfiles/file/vunerutopisa.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0f9iot058au1nepeegodo6vlk6/rokubiludizunojefidi.pdf
    • https://lordoptika.hu/files/files/16099820450.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/41f1a579440f02e63a3c7c7bd2c5b91f/kegasifuxukeso.pdf
    • http://classicalgardenfountains.com/uplds/file/90431208414.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac824feeb33---zopagobulipazimas.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16084d453f396f---vafuzonasu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=people+born+in+1900
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f47e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 16792 bytes
font_01_sfnt_off00010c95.bin
362ca2e65f649f799b26e7618bfd45b95de441caabc072191d30d7318f95e249
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 10300 bytes
font_02_sfnt_off00012396.bin
d33777c70a8d383c9a91c705de133e2063ab23985040b5927d7e8f9e856d8ff5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 18940 bytes